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Lombok builder methods return the instance of the class itself instead of returning builder class

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0

I have a class User

public class User 
 private String firstName;
 private String lastName;
 private int age;

 public User withFirstName(String firstName) 
 this.firstName = firstName;
 return this;
 

 public User withLastName(String lastName) 
 this.lastName = lastName;
 return this;
 

 public User withAge(int age) 
 this.age = age;
 return this;
 

So I can initialize it use User user = new User().withFirstName("Tom").withAge(30);, and after user is initialized, I can still modify it by user.lastName("Bob").age(31);.

How can I leverage Lombok to save the "withXXX" methods? @Builder is not designed for this use case.

java lombok

share|improve this question

edited Mar 17 at 19:39

coderz

asked Mar 17 at 19:26

coderzcoderz

2,47462949

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Builder's designed for exactly this use case, you just write it slightly differently: User.builder().firstName("Tom").age(30).build();
  
  – jonrsharpe
  Mar 17 at 19:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @jonrsharpe But once user is built, I'm not able to modify it with same manner, say user.firstName("foo2").age(23) is not possible.
  
  – coderz
  Mar 17 at 19:37
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That's right, builder is a creation pattern. What exactly are you trying to achieve here?
  
  – jonrsharpe
  Mar 17 at 19:38
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @jonrsharpe I edited the description a little, after user is initialized, I can still modify it by user.lastName("Bob").age(31);
  
  – coderz
  Mar 17 at 19:41
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why not call setters at that point?
  
  – jonrsharpe
  Mar 17 at 19:41
  

  
  
  
  

add a comment | 

0

I have a class User

public class User 
 private String firstName;
 private String lastName;
 private int age;

 public User withFirstName(String firstName) 
 this.firstName = firstName;
 return this;
 

 public User withLastName(String lastName) 
 this.lastName = lastName;
 return this;
 

 public User withAge(int age) 
 this.age = age;
 return this;
 

So I can initialize it use User user = new User().withFirstName("Tom").withAge(30);, and after user is initialized, I can still modify it by user.lastName("Bob").age(31);.

How can I leverage Lombok to save the "withXXX" methods? @Builder is not designed for this use case.

java lombok

share|improve this question

edited Mar 17 at 19:39

coderz

asked Mar 17 at 19:26

coderzcoderz

2,47462949

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Builder's designed for exactly this use case, you just write it slightly differently: User.builder().firstName("Tom").age(30).build();
  
  – jonrsharpe
  Mar 17 at 19:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @jonrsharpe But once user is built, I'm not able to modify it with same manner, say user.firstName("foo2").age(23) is not possible.
  
  – coderz
  Mar 17 at 19:37
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That's right, builder is a creation pattern. What exactly are you trying to achieve here?
  
  – jonrsharpe
  Mar 17 at 19:38
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @jonrsharpe I edited the description a little, after user is initialized, I can still modify it by user.lastName("Bob").age(31);
  
  – coderz
  Mar 17 at 19:41
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why not call setters at that point?
  
  – jonrsharpe
  Mar 17 at 19:41
  

  
  
  
  

add a comment | 

I have a class User

public class User 
 private String firstName;
 private String lastName;
 private int age;

 public User withFirstName(String firstName) 
 this.firstName = firstName;
 return this;
 

 public User withLastName(String lastName) 
 this.lastName = lastName;
 return this;
 

 public User withAge(int age) 
 this.age = age;
 return this;
 

So I can initialize it use User user = new User().withFirstName("Tom").withAge(30);, and after user is initialized, I can still modify it by user.lastName("Bob").age(31);.

How can I leverage Lombok to save the "withXXX" methods? @Builder is not designed for this use case.

java lombok

share|improve this question

edited Mar 17 at 19:39

coderz

asked Mar 17 at 19:26

coderzcoderz

2,47462949

public class User 
 private String firstName;
 private String lastName;
 private int age;

 public User withFirstName(String firstName) 
 this.firstName = firstName;
 return this;
 

 public User withLastName(String lastName) 
 this.lastName = lastName;
 return this;
 

 public User withAge(int age) 
 this.age = age;
 return this;
 

share|improve this question

edited Mar 17 at 19:39

coderz

asked Mar 17 at 19:26

coderzcoderz

2,47462949

share|improve this question

edited Mar 17 at 19:39

coderz

asked Mar 17 at 19:26

coderzcoderz

2,47462949

asked Mar 17 at 19:26

coderzcoderz

2,47462949

asked Mar 17 at 19:26

coderzcoderz

2,47462949

2 Answers
2

active

oldest

votes

3

Try this:

@Data
@Builder
@Accessors(fluent = true) // <— This is what you want
public class User 
 private final String firstName;
 private final String lastName;
 private final int age;

Then to use:

User user = User.builder()
 .firstName("foo")
 .lastName("bar")
 .age(22)
 .build();

And later:

user.setFirstName("baz").setAge(23); // fluent setters

Note how User can be made immutable (best practice) by making all fields final. If you want mutability, remove final keywords.

share|improve this answer

edited Mar 17 at 20:37

answered Mar 17 at 19:33

Bohemian♦Bohemian

301k65431573

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  But once user is built, I'm not able to modify it with same manner, say user.firstName("foo2").age(23) is not possible.
  
  – coderz
  Mar 17 at 19:35
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @coderz then remove final keywords. @Data gives you setters.
  
  – Bohemian♦
  Mar 17 at 19:38
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @coderz Builders are used to make classes immutable. if you need mutability, add just @Getter and @Setter annotations. And even better not use lombok:
  
  – dehasi
  Mar 17 at 19:39
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @coderz try @Accessors(fluent = true)
  
  – Bohemian♦
  Mar 17 at 19:41
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Bohemian @Accessors(fluent = true) is exactly what I want, it works! Can you edit your answer so that I accept it?
  
  – coderz
  Mar 17 at 19:43
  

  
  
  
  

add a comment | 

1

I was trying to find a solution for fluent setters returning a new instance so the instance stays immutable and I found Wither annotation from Lombok experimental features in combination with Value annotation from stable features.

Hope it could help!

share|improve this answer

answered Mar 22 at 9:10

Avelino CollarAvelino Collar

113

add a comment | 

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3

Try this:

@Data
@Builder
@Accessors(fluent = true) // <— This is what you want
public class User 
 private final String firstName;
 private final String lastName;
 private final int age;

Then to use:

User user = User.builder()
 .firstName("foo")
 .lastName("bar")
 .age(22)
 .build();

And later:

user.setFirstName("baz").setAge(23); // fluent setters

Note how User can be made immutable (best practice) by making all fields final. If you want mutability, remove final keywords.

share|improve this answer

edited Mar 17 at 20:37

answered Mar 17 at 19:33

Bohemian♦Bohemian

301k65431573

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  But once user is built, I'm not able to modify it with same manner, say user.firstName("foo2").age(23) is not possible.
  
  – coderz
  Mar 17 at 19:35
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @coderz then remove final keywords. @Data gives you setters.
  
  – Bohemian♦
  Mar 17 at 19:38
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @coderz Builders are used to make classes immutable. if you need mutability, add just @Getter and @Setter annotations. And even better not use lombok:
  
  – dehasi
  Mar 17 at 19:39
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @coderz try @Accessors(fluent = true)
  
  – Bohemian♦
  Mar 17 at 19:41
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Bohemian @Accessors(fluent = true) is exactly what I want, it works! Can you edit your answer so that I accept it?
  
  – coderz
  Mar 17 at 19:43
  

  
  
  
  

add a comment | 

3

Try this:

@Data
@Builder
@Accessors(fluent = true) // <— This is what you want
public class User 
 private final String firstName;
 private final String lastName;
 private final int age;

Then to use:

User user = User.builder()
 .firstName("foo")
 .lastName("bar")
 .age(22)
 .build();

And later:

user.setFirstName("baz").setAge(23); // fluent setters

Note how User can be made immutable (best practice) by making all fields final. If you want mutability, remove final keywords.

share|improve this answer

edited Mar 17 at 20:37

answered Mar 17 at 19:33

Bohemian♦Bohemian

301k65431573

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  But once user is built, I'm not able to modify it with same manner, say user.firstName("foo2").age(23) is not possible.
  
  – coderz
  Mar 17 at 19:35
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @coderz then remove final keywords. @Data gives you setters.
  
  – Bohemian♦
  Mar 17 at 19:38
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @coderz Builders are used to make classes immutable. if you need mutability, add just @Getter and @Setter annotations. And even better not use lombok:
  
  – dehasi
  Mar 17 at 19:39
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @coderz try @Accessors(fluent = true)
  
  – Bohemian♦
  Mar 17 at 19:41
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Bohemian @Accessors(fluent = true) is exactly what I want, it works! Can you edit your answer so that I accept it?
  
  – coderz
  Mar 17 at 19:43
  

  
  
  
  

add a comment | 

Try this:

@Data
@Builder
@Accessors(fluent = true) // <— This is what you want
public class User 
 private final String firstName;
 private final String lastName;
 private final int age;

Then to use:

User user = User.builder()
 .firstName("foo")
 .lastName("bar")
 .age(22)
 .build();

And later:

user.setFirstName("baz").setAge(23); // fluent setters

Note how User can be made immutable (best practice) by making all fields final. If you want mutability, remove final keywords.

share|improve this answer

edited Mar 17 at 20:37

answered Mar 17 at 19:33

Bohemian♦Bohemian

301k65431573

@Data
@Builder
@Accessors(fluent = true) // <— This is what you want
public class User 
 private final String firstName;
 private final String lastName;
 private final int age;

User user = User.builder()
 .firstName("foo")
 .lastName("bar")
 .age(22)
 .build();

user.setFirstName("baz").setAge(23); // fluent setters

share|improve this answer

edited Mar 17 at 20:37

answered Mar 17 at 19:33

Bohemian♦Bohemian

301k65431573

answered Mar 17 at 19:33

Bohemian♦Bohemian

301k65431573

answered Mar 17 at 19:33

Bohemian♦Bohemian

301k65431573

1

I was trying to find a solution for fluent setters returning a new instance so the instance stays immutable and I found Wither annotation from Lombok experimental features in combination with Value annotation from stable features.

Hope it could help!

share|improve this answer

answered Mar 22 at 9:10

Avelino CollarAvelino Collar

113

add a comment | 

1

I was trying to find a solution for fluent setters returning a new instance so the instance stays immutable and I found Wither annotation from Lombok experimental features in combination with Value annotation from stable features.

Hope it could help!

share|improve this answer

answered Mar 22 at 9:10

Avelino CollarAvelino Collar

113

add a comment | 

I was trying to find a solution for fluent setters returning a new instance so the instance stays immutable and I found Wither annotation from Lombok experimental features in combination with Value annotation from stable features.

Hope it could help!

share|improve this answer

answered Mar 22 at 9:10

Avelino CollarAvelino Collar

113

share|improve this answer

answered Mar 22 at 9:10

Avelino CollarAvelino Collar

113

answered Mar 22 at 9:10

Avelino CollarAvelino Collar

113

answered Mar 22 at 9:10

Avelino CollarAvelino Collar

113